Bordeaux-red sulfur dye and process of making same.



UNITED STATES PATENT OFFICE.

ALBRECHT SCHMIDT, OF HOUHST-ON-THEMAIN, GERMANY, ASSIGNOR TO FARBWERKE, VORM. MEISTER, LUOIUS & BRUNING; OF HOCHST-ON- THE-MAIN, GERMANY; A CORPORATION OF GERMANY.

BORDEAUX-RED SULFUR DYE AND PROCESSOF MAKING SAME.

Specification of Letters Patent.

Patented Aug. 28, 1906.

Application filed February 15, 1906. Serial No. 301,166.

To all whom it may concern/.-

Be it known that I, ALBRECHT SCHMIDT,

Ph. D. a citizen of the German Empire, re-

siding at Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in Pure Bordeaux-Red Sulfurizcd Dyestuffs and Processes of Making Same, of which the following is a specification.

In United States Patent No. 7 01,435 have been described brown-violet, blue-violet, and reddish-violet sulfurized dyestuffs, the oxyazins of the type value. Sulfurized dyestuffs from bodies of the type Alliyl from safraninones of the fatty series are not described in United States Patent No. 701,435. I have found inde endently of said patent that bodies of the ast-named type when heated with alkali polysulfid yield sulfurized dyestuffs dyeing a decided bordeaux red of hitherto unknown purity and redness. This could not be foreseen, for amuddy reddish violet brown and not a pure bordeaux red was to be expected. Pure bordeaux-red sulfurized dyestuffs are obtained from safraninones of the fatty series insoluble in alkali in contrast to the not alkylated oxazins, which are derived from ineta-toluylenediamins alkylated in para position to the methyl group. To obtain very ure products with as little blue tint as possi )le, it is best not to raise the temperature too much, though even at a higher temperature and if further sulfurized products are obtained which are only slightly less pure. By starting from such safraninones of the fatty series as are obtained from chlorinated para-aminophenols sulfurized dyestuffs free from chlorin may also be obtained by first substituting the chlorin atoms for the SH groups by heating with alkali sulfids and by then sulfurizing the merkaptans thus obtained and transforming them into real sulfurized dyestuffs.

. The sulfurized dyestuffs may be obtained from etho-safraninone which is best prepared from para-nitrosophenol and mono-eth lrne'ta-toluylenedianiin (OH NH NHO H y first combining these two into indophenol and then transforming the product by boiling into ethosafraninone Q Near Example I: Seventy-two parts of nitrosophenol sodium containing about thirtyone parts of nitrosophenol of one-hundredper-cent. strength are dissolved in about one thousand parts of water and just made acid to con 0 with hydrochloric or sulfuric acid. This so ution is added with stirring for about an hour to about fifteen hundred parts of a solution partly neutralized with about one hundred and forty-five parts of sodium carbonate, of 37.5 parts of mono-ethyl-meta-toluylenediaminbase and of about one hundred and ten parts of HCl, (reducin after the electrolyticaf k whereupon the indophenol partly separates.- To this is added, isolating the indophenol not re uisite, about one hundred parts of sodium caf'bonate and then heated, whereupon about two hundred parts of manganese paste (forty er cent. of MnO,) are added and thewhole eated until the blue tint on blotting-paper gives way to a red shade. The filtered residue is boiled with a solution of sodium carbonate and then with dilute hydrochloric acid. From this solution the hydrochlorid of ethosafraninone crystallizes when cold. By

liquid, for instance,,' elimination of tin,)

starting fron para-amidophenol the indophenol is produced in the-usual manner by oxidation. Ten parts of this ethosafraninone are heated with fifty-five parts of crys tallized sodium sulfid, twenty five parts of sulfur, or, for instance, eighty parts of sodium sulfid and forty parts of sulfur to about 110 to 135 centigrade in a reflux ape paratus after evaporating part of the Water until no further increase of dyestufi' occurs. The safraninone insoluble in alkali hydrate and alkali sulfids becomes gradually dis-- solved. The dyestufi thus obtained may be precipitated from the solution of the mass by acids or air. It is readily soluble in alkali sulfids and dyes cotton a beautiful pure bordeaux. When treatedwith copper salts on the fiber, it has the valuable property of becoming'a pure violetof great fastness'.

Example II: If for the etho base mentioned in. Example I be substituted the cor responding metho base from mono-methylmeta-toluylenedialnin, a dyestuif having; the

same properties is obtained. The reaction is similar, for instance, withthe benzylo base (from benzyl meta toluylenediamin) and with the derivatives by substitution of paraaminophenol, like, for instance, the color bases obtained from ortho-chloro-p ara-aminophenol, para amino ortho cresol, para- I aininosalicylic acid, para-aminophenol-ortho sulfonrc acid, on the one hand, and from monoalkylated meta-toluylenediamins, on the other hand. The shades of the dyestuffs thus obtained hardly differ from each other. If the temperature is raised, for instance, to 140 to 160 Centigrade, somewhat bluer products are obtained. The forn ation of the dyestuff may also occur by using other diss0lvents-for instance, a solution of glyc erin-or also by using pressure. portions of sodium .sulfid and sulfur may likewise be varied.

Having now described my invention, What I claim is 1. The processherein described for the manufacture of pure bordeauzered sulfurized dyestuffs by heating the safraninones of the fatty series with sulfur and alkali sulfide.

2. As products, the bordeaux-red sulfurized dyestuffs obtained by heating the saira- The proninones of the fatty series With sulfur and al- 4 kali sulfide, being soluble when heated with alkali sulfide, dyeing from this solution on unmordanted cotton bordeaux-red shades which beconieviolet when treated Withoopper salts.

in testimony that I claim the foregoing as my invention i have signed my name in, presence of" two subscribing Witnesses.

ALBRECHT SCHMIDT. Witnesses.

JEAN GRUND, CARL Gnome. 

